BirdAnalyst
Species · Wyoming · BBS 2025 Release · 1966–2024

Song Sparrow Population Trend in Wyoming

All statesGeneralists

Song Sparrow in Wyoming has surged: up 137% on the route-weighted index since 1970.

+137%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
104Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Song Sparrow Trends in WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Song Sparrow has surged in Wyoming: up 137% on the route-weighted index since 1970.

Song Sparrow Population Forecast in Wyoming

If the recent trend holds, Song Sparrow in Wyoming is projected to stay roughly flat through 2029, near 3.4 (95% range 2.2–4.7). A 5-year backtest shows a typical error of ±26.5%, with 100% of held-out values landing inside the 95% band.

+9%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
3.4Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
2.2–4.795% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±26.5%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Song Sparrow in Wyoming is projected to stay roughly flat through 2029, near 3.4 (95% range 2.2–4.7). A 5-year backtest shows a typical error of ±26.5%, with 100% of held-out values landing inside the 95% band.19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20253.32.04.5
20263.32.14.6
20273.42.14.6
20283.42.24.6
20293.42.24.7

Song Sparrow Survey Routes in Wyoming

Routes recording Song Sparrow in Wyoming.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Buckskin Mtn2720211980
Wilson2520241979
Boulder2020241983
Big Sandy2020241987
Pathfinder1820181983
Seedskadee 21820242024
Alpine1720241979
Fontenelle1420241982
Pine Tree1419951993
Soda Lake1320241981
Riverside1120241968
Mtn View1120241980
Green River1119821977
Meeteetse920241993
Cody820241983
Basin820241971
Seedskadee820231986
Nowood720241988
Lysite720241998
Warbonnet720241990
Horse Creek620241982
Sundance520241976
Dubois520241968
Yoder519711968
Dayton520241980

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.